Ekman, Per; Möller, Hans; Hedlund, Rune; The long-term effect of posterolateral fusion in adult isthmic spondylolisthesis: a randomized controlled study. The spine journal : official journal of the North American Spine Society, 5 (1). pp. 36-44. ISSN 1529-9430 https://researchonline.lshtm.ac.uk/id/eprint/19997 Full text not available from this repository.